Thread-cutting machine



May 22, 1923. 1,456,439

F. w. HESSMER THREAD CUTTING MACHINE Filed Oct. 6, l919 5 Sheets-Sheet 1 May 22, 1923. 1 1,456,439

F. w. HESSMER THREAD CUTTING MACHI NE May 22, 1923.

F. W. HESSMER' THREAD CUTTING MACHINE Filed Oct. 6 19 9 3 Sheets-Sheet 5 1T iii.

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FREDERICK w. HESSMEB, on annsnv CITY, New JnnsEY, 'nssrenon ro AMERICAN MUSICAL SUPPLY COMPANY, or JERSEY CITY, NEWJERSEY, a CORPORATION or NEW JERSEY.

'THREAD-GUTTING MACHIN Application. filed October 8, 1919. Serial 1To;328,781.

To all who-m it may concern Be it known that l, Fnnnnnrcn N. Hnss- MER, a citizenbf the United States,'and resident of Jersey Cit ,in'the county of Hudson and State of ew Jersey, have invented certainne-w and useful Improvements in Thread-Cutting Machines, of which the following is a specification.

My invention relates to improvements in thread cutting machinesand the object of same is'a machine adapted to cut relatively long and fine threads upon thinrods and a further object is to cut the thread as perfectly and accurately as possible at the same time'makingthe operation as speedy as pos- Sibleito reduce the'cost ofproduction con-- siderably.

The nature ofmyinvention will be fully understood from' the description given be low and from .the'accompanying drawings forming part of this specification.

In said drawings, l lig. l is a plan VlBW of the machine, Fig.2is a side elevation, Fig. 53 a front elevation, and Fig. 4:: shows certain details of construction explained in the course of the description.

'Likenumerals refer to like parts in the several figures.

1 denotes a bed plate of the supporting frame 2, the plate carrying a frame 3 upon which journals 4 and 5 are secured,.shaft 6 being movably arranged in said jOlllIlZLlS. In about the middle of'main shaft 6 there is a lead screw Tprovided adjoining pulley S; the chuck9 is provided at the free end of said shaft, the other'end of same being movably engaged by one of the fingershaped points of a powerful spring 10. This spring presses against the center point of shaft (5, whereas the other end of spring 10 is similarly held, in the same axis, in the upright arm 11. Upon frame 3 there is provided another journal 12 having a fork-shaped terminal between the arms of which a cylindrical block 13, having an upright arm l l'with a horizontal extension l5which has as pivot the screws lG'and 17. The arm 15 has a hole 18 in which by screw 19 a stamp 20with a thread, -answering as to pitch and other measurements screw 7 ,is secured, the stamp 20 resting directly upon said thread. Arm I5 is furthermore at its'free end extended into a hook 21 to holda weightf22 thereby.

Upon frame 3 there is also mounted journal 23 to which at itsupper end arm 24: is pivoted in such way that the downwardly bent end ismovably secured to said journal by means of screw point 25 as'a pivot, while rod 26, which at its other end is m0vably laid through journal 27, is rigidlysecured to arm 2$by means of screw 25' so that it will follow all movements of arm2 l.

The free end of arm 24 has the shape of the letter V turned upside down, and :is at its utmost end of a fork-like shape, between the arms of which a wheel 28 is movably arranged and held'in position by means of pin 29. This latter wheel is resting (Fig. 3)

upon the highest point of eccentric'or camwheel 30 secured to auxiliary shaft'3l movably arranged in journals 32 and 33-and operated by pulley 34:. At the other end of shaft 31 there is a 'guidewheel 35 secured to I it, about one half of its face being'broken away.

This guide wheel 35 presses against a little pulley 36 movably held by pin 37 within fork 38 of shaft 39 movably arranged within journals 40'and' ll. Furthermore there is a standard 42 at the top of, which by means of'a screw a flat lever li-3 is movably secured, said lever 43 having slit 4% put over the upright pin 4.5 on shaft '39. "At about its middle lever i3 is twisted 90 degrees .and isprovided with a hook t6 which is engaged by a powerful spring 47 held at its other end by hook l8nattached to bed plate 1. At the end ofthevertical part of the structure bvbeing rigidly connected to the bent brace 54 held'in position by 'strong screws upon journal55 (Fig. 3) securedto bed plate 1. Between the upright arms "'52 and 53 rod 50 is provided with two knobs 56 and '57 a certain distancefrom'ea'chother.

. Itis obvious from the drawings that rod'fiO leads to and disappears'within theflo'west point of box 58 representing a magazine held in an inclined position by the plate 59, having a hole 59, secured to journal 55 which likewise carries oil tank 59 by means of support 60, the outlet 61 of tank 59" discharging its contents to the lowest point of magazine or boX 58; the arm 62 is secured to journal 55 and reaches into magazine 58 to regulate the feeding of the pins.

In the field of the bed plate between the length sides of frame 3, in which the journals 4 and 5 are put in, there is a block 63 (see Fig. 4) which is provided with a mold adapted to receive a cylindrical body. The lowest point of the mold is on the same level with the lowest point of rod 50 as well as of the lowest point of the inside of box 58. In the arm 24 there is a slot in which a stamp 64, provided with a cutting die 65, secured by screw 66 to said arm 24, screws 6'? and 68 preventing said die from slipping to wards the sides; there is another recess or hole in said arm 24 close to wheel 28 in which, a strong iron rod 69 is movably secured therein to carry a heavy weight 70 at its lower end.

Close to pulley 8 there is on each side of same through the frame a hole 71 and 72, respectively, through which a belt may be laid over pulley 8 and pulley 73 on shaft 74, same being actuated by loose and fast pulley 75 and 76, respectively; pulley 34 is actuated by means of pulley 77 indicated on shaft 74. A starter for shifting the belt from loose to fast pulley and vice versa is .not shown as it is not necessary to dwell upon such matters familiar to men who know the art, likewise lubricating devices are not particularly indicated when their provision is a well understood matter.

I am going to describe now the operation of my new invention and before entering into any details of same I wish to state that the machine is constructed preferably for cutting threads upon round iron pins which mostly have one of their ends flattened out.

so as to have a more or less prismatic point on this end, all the pins being of exactly the same length.

All the parts being well lubricated and the machine otherwise put in working shape the magazine 58 is filled with the pins, the prismatic heads showing towards block 63.

Assuming that the machine in the moment it is started to run is standing exactly as seen in Fig. 1 it is obvious from the above that rod 50 during the continuation of the motion of guide wheel 35 will push the pin at the lowest point of box '58 out of same through the hole 59 over to and unto the block 63.

The delivery of the pins is regulated by the arm 62 which reaches with its bent end, into the magazine or box ,58; as said arm terminates close to the bottom of said box 58 in a distance only slightly larger than the diameter of a pin, it is obvious that only one pin at a time can pass to the lowest point of'the box 58 to be acted upon by rod 50.

Chuck 9 has a recess of rectangular shape so that the prismatic end of the pins will lit in and as soon as rod 50 pushes the pin unto block 63 it is ultimately entering chuck 9 and retained by it while being pressed against said chuck by rod 50. This is effected, as already alluded to above, by means of guidewheel 35. Part of the face of wheel 35 being broken away lever 43 is pushed outward when the high points of the edge of guidewheel 35 press against wheel 36 thus pushing shaft 39 with its pin 45 outwardly which movement the lever 'is forced to follow. The reverse is taking place when spring 47 contracts and presses lever 43 against pin 45 causing shaft 39 with wheel 36 to press against and follow the edge of guidewheel 35 allover the recessed part. The effect of these forth and back motions is very-important because any time lever 43 turns towards the magazine 58 it pushes rod 50 all through the lowest part of said magazine 58 thereby pushing the pin admitted by regulating arm 62 into the lowest part of said magazine, out of same and through hole 59* unto block 63 where its prismatic head is caught and held by chuck i). The pin immediately follows the rotation of shaft 6 and at this moment arm 24 is also lowered until the stamp 64 with a die thread'65 at its lower end reaches down upon the pin resting during its rotation upon block 63. As the heavy weight 70 is acting upon arm 24 it is natural that the die thread 65 f stamp 64 will cut a thread into the pin during its rotation. The length and other details of this thread are regulated by two factors, to wit, the lead screw 7 in connection with the die 20 sliding along said thread and the excentric or edge cam 30 in connection with wheel 28 at the V bent end of arm 24. In Fig. 3'stamp 65 is seen lifted off block 63 as wheel 28 is practically at the highest point of said edge cam 30 but from the form of this latter cam it is obvious that arm 24 will lower in the further course of rotation to alternately rise and lower according to the location of wheel 28 on cam 30; it is also self moves towards spring because stamp acts on lead screw 7, thereby causing the two finger-shaped ends of spring 10 almost to come together. In this moment the pin has the desired length and the pin must therefore be removed to make room for the next one. Theremoval of the pin is cause by the effect of four different actions, two of same going on simultaneously.

The first of these four actions is the lifting of stamp 6-1 with the thread 65 off the pin by cam wheel 30, lifting arm'24, and the other simultaneous similar action is the lifting of arm 15, and thereby also of stamp 20, oif lead screw 7 by means of a projection 26 indicated in dotted lines on shaft 26, said projection pressing arm 15 upwardly in the moment when arm 24 is lifted by cam-wheel 30. These two simultaneous actions allow spring 10, of powerful construction, to push shaft 6 back to its original location after edge guidewheel has shortly before pushed lever et3 to the outside thereby taking rod along.

The withdrawal of rod 50 is so timed that there is no longer any pressure on the finished pin so as to allow the finished pin to be thrown out of chuck 9 and block 62 when spring 10 pushes shaft 6 back to its original position. The finished pin drops into an inclined guideway 7 9 into a receiver (not shown) from where it is taken for further treatment. Oil is constantly dripping from tank 59 into magazine 58 to lubricate the pins before their transfer unto block 63.

Having now described my new invention I beg to state that some changes can be made without departing from the spirit of same and such changes come within the scope of the appended claims.

lVhat I claim is:

1. In a thread cutting device the combination of a support adapted to receive a cylindrical body or pin, a shaft, a chuck, having a recess adapted to receive the pin, at one end of the shaft, means to deliver a pin unto the support and into the chuck, means to impart motion to the shaft, a die adapted to be pressed unto said pin, means to lower the die while it is pressed unto the pin, means to shift the shaft away from the pin support while the die is pressed upon the pin, means to lift the die, and means to shift the shaft back to its original position.

2. In a thread cutting device the combination of a support adapted to receive a cylindrical body or pin, a magazine, having an inclined position for holding the pins, a shaft, a chuck, at one of its ends, said chuck having a recess adapted to receive one of the pins, a rod adapted to make a reciprocating horizontal motion to enter the lowest point of aforesaid magazine and to deliver a pin therefrom unto the support and into the chuck means to impart motion to the shaft, a die adapted to be pressed unto said pin, means tolower the dies while it is drical body or pin, a magazine, having an inclined position, for holding the pins, a

shaft, a chuck at one of its ends, said chuck having a recess adapted to receive a pin, a rod adapted to make-a reciprocating horizontal motion to enter the lowest point of said magazine and to deliver therefrom'a pin unto the support and into the chuck, means to impart motion to the shaft, a die secured to a pivotally arranged arm adapted to be lowered unto and lifted from the pin to be threaded, a lead screw upon the shaft, a die secured to a pivotally arranged arm resting upon said lead screw thereby moving the shaft away from the pin support, means to lift the aforesaid die from the lead screw, and means to move the shaft back to its original position.

4c. In a thread cutting device the combination of a support adapted to receive a cylindrical body or pin, a magazine, having an inclined position, for holding the pins, a main shaft, a chuck at one of its ends, said chuck having a recess adapted to receive a pin, a rod adapted by means in connection with an auxiliary shaft to make a reciprocating horizontal motion to enter the lowest point of said magazine and to deliver therefrom a pin unto the support and into the chuck, means to impart motion to the shaft, a die secured to a pivotally arranged arm pressed unto the pin by means of a weight and lifted therefrom by means of an excentric cam secured to the aforesaid auxiliary shaft, a lead screw upon the main shaft, a die secured to a pivotally arranged arm resting upon said lead screw thereby moving the shaft away from the pin support, means to lift the aforesaid die from the lead screw, and means to move the shaft back to its original position.

5. In a thread cutting device of the character as described, the combination of a shaft operatively connected with means to impart rotation, an auxiliary rotary shaft provided at its free end with an edge cam and an excentric/cam adjoining aforesaid edge cam, another auxiliary shaft operatively connected with aforesaid edge cam to make reciprocating horizontal motions, a bar pivotally secured to a standard and operatively connected with aforesaid auxiliary shaft making reciprocating motions, and of an arm, having a cutting die rigidly secured thereto, operatively connected with aforesaid excentric cam.

6. In a thread cutting device of the character as described, the combination of the arm holding the cutting die, said arm being pivotally arranged at one of its ends upon the supporting frame and being provided at its other end with a guide wheel sliding upon an excentric cam causing the arm to move alternately in a down and upward direc'tion, a rod ri idly secured to the arm in the axis of its pivots and being journaled at its other end, said rod running parallel to the main shaft, an upwardly directed projection secured to said rod, another arm,

holding the die to fit the lead screw, pivotally secured at its end opposite to the pivot, of the arm referred to above, a Weight acting upon said arm at its end to hold it down upon the projection on the rod, this latter arm being lifted simultaneously With the arm holding the cutting die, thereby allowing the spring acting at the end of the main shaft to move it back to its original position.

Signed at Jersey City, in the county of Hudson and State of New Jersey this third day of October A. D. 1919.

FREDERICK WV. HESSMER. 

